Not a list as such but you can use the following:
%NL% = New Line
%ANCHORTEXT% = inserts the anchor text that is being used with that post
If there are others you would like adding then by all means request them.
UPDATE:
Full list of comment spintax tagsAlso as of an update after this post was made you can now add these tags via the Text Rewriter using the button in the top left of the window.